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Simplifying -3x + 21 = -2x + 12 Reorder the terms: 21 + -3x = -2x + 12 Reorder the terms: 21 + -3x = 12 + -2x Solving 21 + -3x = 12 + -2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2x' to each side of the equation. 21 + -3x + 2x = 12 + -2x + 2x Combine like terms: -3x + 2x = -1x 21 + -1x = 12 + -2x + 2x Combine like terms: -2x + 2x = 0 21 + -1x = 12 + 0 21 + -1x = 12 Add '-21' to each side of the equation. 21 + -21 + -1x = 12 + -21 Combine like terms: 21 + -21 = 0 0 + -1x = 12 + -21 -1x = 12 + -21 Combine like terms: 12 + -21 = -9 -1x = -9 Divide each side by '-1'. x = 9 Simplifying x = 9
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